Counting Atoms and Molar Mass (II)
Directions: Fill in the data table with the correct data.
Consider the compound ammonium chloride: NH4Cl
Atoms
N=
H=
Cl =
Mass
x
x
x
Total
=
=
=
Molar Mass =
How many molecules of ammonium chloride are in 22 grams?
Consider the compound barium ferrite: BaFe2O4
Atoms
Ba =
Fe =
O=
Mass
x
x
x
Total
=
=
=
Molar Mass =
How many molecules of barium ferrite are in 2.2 grams?
Consider the compound lithium perchlorate: LiClO4
Atoms
Li =
Cl =
O=
Mass
x
x
x
Total
=
=
=
Molar Mass =
How many molecules of lithium perchlorate are in 2.5 grams?
Consider the compound iron (III) nitrate: Fe(NO3)3(H2O)9
Atoms
Fe =
N=
H=
O=
Mass
x
x
x
x
Total
=
=
=
=
Molar Mass =
How many molecules of iron (III) nitrate are in 10.5 grams?
Symbol
Atomic #
Mass #
# Protons
# Electrons
# Neutrons
17
13
Hg
42
14
82
11
Atomic # is the # of _______________
Mass # is the number of __________ + __________
The number of neutrons is the ___________# - the # of _____________
If the atom has no charge, then the #______________ = the # _______________